This document provides information on factors that influence human comfort outside, including the built and natural environment, sunlight, temperature, clothing, wind, evaporative cooling, and humidity. It discusses how each factor impacts thermal comfort and regulates body temperature. For example, it explains that sunlight provides vitamin D but can also cause skin damage, and that temperature, air movement, and humidity all influence the rate of heat transfer and evaporation from the body. The document aims to educate on characteristics of the outdoor environment that affect human comfort.

1. Welcome to
Human outside comfort

2. Victoria University Collage
Engineering Foundation Section(D)
GROUP (4)
1) Aung Thu Phyo
2) Sis Naing Myo
3) Mya Eain Si
4) Su Moon Oo
5) Myat Yoon Lwin

3. The Environment
There are two kinds of environments.
They are-
(1) the built environment and
(2) the natural environment.

4. The built Environment consist of all other
things that have been constructed or tall
building by human beings.

5. Natural Environment including of River, Forest ,Plants,
Animals, and Ecosystem etc………..

6. Human outside Comfort
There are six factors that influence how a person will feel
when going outside. They are
 Sunlight
 Temperature
 Clothing
 Wind
 Evaporative cooling
 Humidity

7. SUN LIGHT
Sunlight is a radiation rays
but little advantage
considering mental health.
Then Animals and plants
all specific living to their
environment need to sun
too….
There are many
disadvantages . Sunlight's
are skin cancer and Eye
Damage , etc….

8. Sunlight creates vitamin D in the form of cholecalciferol
when it hits our skin. Cholecalciferol can also be taken
up from the diet. Once in the body the cholecalciferol
called vitamin D3 is converted by the liver into calcidiol,
the form that is measured in tests for blood levels of
vitamin D.

9. Sun Damage
The suns rays = radiation.
Radiation = skin damage.
Radiation + skin damage = Skin Cancer.
Think about it.
Sometimes sun light is very dangerous condition
for People.

10. Sun Cancer occurs when you over expose your skin
to harsh sunlight. The ultraviolet rays emitted by the
sun damage your skin’s elastin , results in sunburn ,
age spots or brown spots are some of the other
indications of Sun Cancer. You can treat this
condition by using skin care products or through
various other cosmetic procedures.

11.  Temperature
Temperature is a measure of the degree of heat intensity.
Temperature is a physical property of a system that
underlines the common of hot and cold but temperature is
hotter generally has the greater temperature.

12. Temperature
There are main two type’s of
temperature in the world. They
are
Air temperature
Evaporative temperature

13. Skin Temperature
Skin temperature depends on air temperature and
time spent in that environment. Such weather
factors as wind chill and humidity cause changes
in skin temperature. The normal temperature of
skin is about 33 °C or 91 °F.

14. Clothing
Another determinant of thermal comfort is
clothing.
Dark clothes hold the heat, so instead
choose whites, that reflect it slightly active
and wear typical indoor clothing.
Clothing, through its insulation properties, is
an important modifier of body heat loss and
comfort.

15. Clothing

16. Wind
oWind is the flow of all gases on a large scale .
oWind is an important source for renewable
energy .
oWind could produce energy for the whole in the
world.

17. Wind

18. Basic information on wind energy and wind
technology, resources, use a lot of
electricity.So include air turbine is a very
useful to our environments.

19.  Air Movement
Air motion significantly affects body heat
transfer by conduction and evaporation.
 Air movement results from free (natural)
and forced convection as well as from the
occupants’ bodily movements.
 The faster the motion, the greater the rate
of heat flow by both convection and
evaporation.

20. Evaporation
The body can either gain
or lose heat by radiation
and conductive-convective
heat transfer, depending
on the temperature of the
surrounding objects and
ambient air. By contrast,
evaporation is exclusively
a cooling mechanism.
When the surrounding
environment is about 70°F
(21°C), most people lose
sensible heat at a rate that
makes them feel
comfortable.

21. Evaporation

22. HUMIDITY
Amount of water
vapour is include in
the air. One of the
most variable
characteristics of the
atmosphere,
humidity is an
important factor in
climate and weather .

23. Saturate
 Humidity varies
because the water-
holding capacity of
air. When a volume
of air at a given
temperature holds
the maximum
amount of water
vapour possible,the
air is said to be
saturated.

24. If
the
air
is
too
dry
As relative
humidity
drops 70% to
30%, our
personal
comfort is
jeopardized as
our life dries
out.

25. Humidity is measured in two ways
 (1) Absolute humidity is the percentage of
water vapor actually present in the air.
(2) Relative humidity is the absolute
humidity divided by the amount of water.
Relative humidity indicates the degree of
comfort or discomfort one feels from the
humidity, because it indicates the amount of
perspiration that can evaporate from the
skin.

26. Thank You for
Your attention.